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S550 2007 had trouble going up hills rough idle, horrible gad mileage, codes keep cha
In the past year i replaced the computer ($2100) transmission (4500) maf, map, suspension compressor, fuel pump. But she is still freaking at it. The codes will change after they are wiped. Sometimes the misfires are on right side, sometimes the left side. Its lean and rich.. i give up please help
P030X are the 1 to 8 coil packs aren't they ? if so they die ALL DAY LONG to age to 7 year and 40k miles they will all go pop one by one (P0301 I think is front left, from drivers point of view) if you take a good one and swap the fault will move to the other cyl
if money is tight any from V8 and V6 petrol are the same and replace one by one as you go - NEVER drive with this code as it will screw the cats and cause more issues